If you download an ISO for HP,Professional or Ultimate open it with Ultra ISO program and remove the ei.cfg file from the sources folder so the ISO can be used to install any version of Windows.A 64bit ISO is only good for 64bit versions and 32bit ISO for x86 versions.

The torrents are old and my have only a few seeders

The Dell ISO are larger than normal Windows 7 ISOs because of included language packs.